Reading thru the text article recommended for new '87 300D owners, I came across the paragraph discussing coolant. The author stated that the MB coolant would be yellowish or clear, and that the aftermarket equivalent was Zerex G-05.

For my '05 Jeep CRD, factory fill is Mopar HOAT. Doing some checking, it seems both Ford and DC went with the HOAT type antifreeze. Difference is, factory fill in Ford's is a yellowish tint, and DC has their factory fill dyed pink. And here as well, Zerex G-05 is listed as the aftermarket equivalent.

If Zerex G-05 is listed as the aftermarket equivalent in both cases, that seems to indicate that both the '87 300D and '05 CRD use a HOAT type coolant ('05 Jeep CRD is a diesel for those that don't know).

If that's the case, that Ford, DC, and MB are using the same HOAT formula, would that mean you would be able to use either Zerex G-05, MB factory fill, Ford factory fill, or Mopar HOAT in the '87 300D?

That would greatly simplify things, being able to use the same antifreeze for both diesels. Matter of fact, I already have a 1 gallon jug of full strength Mopar HOAT on hand just in case the CRD needs topping off.

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Just say "NO" to Ethanol - Drive Diesel

Mitchell Oates
Mooresville, NC
'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
Grumpy Old Diesel Owners Club